LeanBox — which provides refrigerated vending machines full of healthy and fresh food — is one of the few startups that has its office in an actual mansion. The building at the corner of Massachusetts and Commonwealth avenues was built in 1883 for Oliver Ames, who was once governor of Massachusetts, and his wife Anna Coffin Ames, according to BackBayHouses.org. The space is dominated by dark, carved wood, fabric-covered walls, crystal chandeliers and gold-trimmed tray ceilings.